Step
*
of Lemma
geo-isleft_wf
∀[g:EuclideanPlaneStructure]. ∀[a,b:Point]. ∀[c:{c:Point| a # bc} ].  (isleft(a;b;c) ∈ 𝔹)
BY
{ ProveWfLemma }
Latex:
Latex:
\mforall{}[g:EuclideanPlaneStructure].  \mforall{}[a,b:Point].  \mforall{}[c:\{c:Point|  a  \#  bc\}  ].    (isleft(a;b;c)  \mmember{}  \mBbbB{})
By
Latex:
ProveWfLemma
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